How much yeast nutrient to use?

Normally, for regular yeast strains, a common recommendation is to use around 1 gram of yeast nutrient per gallon (or around 0.26 grams per liter) of wort.

For a 24-liter batch, you could consider using around 8 to 12 grams of yeast nutrient in total, which is roughly 0.33 to 0.5 grams per liter.